feat: open-source 小浣熊阅读 for iOS

Tests/LegadoCoreTests/BookRepositoryTests.swift

@@ -0,0 +1,21 @@
+import Foundation
+import Testing
+@testable import LegadoCore
+
+struct BookRepositoryTests {
+    @Test func persistsBooksAtomically() async throws {
+        let directory = FileManager.default.temporaryDirectory
+            .appending(path: UUID().uuidString, directoryHint: .isDirectory)
+        let fileURL = directory.appending(path: "books.json")
+        defer { try? FileManager.default.removeItem(at: directory) }
+        let repository = FileBookRepository(fileURL: fileURL)
+        var book = Book(bookUrl: "https://example.test/book/1", name: "测试书", author: "作者", origin: "https://example.test")
+        book.durChapterIndex = 3
+
+        try await repository.save([book])
+        let restored = try await repository.load()
+
+        #expect(restored == [book])
+        #expect(restored.first?.durChapterIndex == 3)
+    }
+}